Machine for drawing threads from fabrics



Jan. 31 1933. JALBERT 1,895,995

MACHINE FOR VDRAWI N G THREADS FROM FABRICS 'Filed April 14, 1931 5 Sh'eets-Sheet l Jan. '31; 1933. G. JALBERT MACHINE FOR DRAWING THREADS FROM FABRICS Filed April 14, 1931 3 Sheets-Sheet 2 m I n a I y I a I u I I w I I w u Jan. 31, 1933. JALBERT MACHINE FOR DRAWING THREADS FROM FABRICS s sheets-sheet 5 Filed April 14, 1931 SIM I Patented Jan. 31, 1933 UNITED STATES PATENT'TOFFICE' GEORGES JALBER-T, or PARIS, FR NCE, ASSIGNOR 'ro ANCIENS ETABLISSEMENTS a, QORNELY & 0112., soeni'rn ANONYME, or PARIS, FRANCE, A COMPANY or FRANCE MACHINE son DRAWING THREADS "mom FABRICS Application filed April 14, 1931, Serial No. 530,095, and in France April 19, 1930.

The present inventionrelates to machines for drawing threads from fabrics. A threaddrawing machine comprises, in general, a frame similar to that of a sewingmachine,

5 and is furnished with the following principal parts :-a thread-drawing tool or piercer, consisting ofa saw-toothed spear or blade which passes through the fabric and draws out the threads, a knife intended for cutting off the drawn threads, a presser-foot intended to stretch or hold the fabric, and feeding means intended to effect the advance'of the is arranged to rotate upon a horizontal axis so that it can easily pass between the two a fork arms or branches of the feeding device. Nevertheless it will be understood that a perfect adjustment as to height is very difii-l cult to obtainwith this kind of cutter knife.

Another condition for good work is the proper stretching or holding of the fabric at the moment of the action of the thread drawing tool.

5 The present invention has essentially for 5 knife may also receive, by the aid of suitable controlling means, a reciprocating movement in the direction of its axis of rotation, which allows the feeding devices to be retained in their normal position. Lastly, 5Q an improved holding or stretching device,

ticular devices entering into the improveoperated by the machine, allows the fabric to be held stationary during the action of the thread-drawing tool. I i

The following description relating to the annexed drawing, given by way of example, will explain one manner in which the invention can be carried out; In these drawings,-

Figure 1 is a sectional View of the head of the machine and'shows the general arrangement of the improvements forming the subect of the invention. Figure 2 is a diagrammatic end view thereof, certain parts being omitted to show the essential parts of the invention. V (it; Figure 3 is a detail, being a plan of the lower part of Figure 2.

Figures 4 and 5 are detail views of parments. 7o

Figure 6 is a part section, on a larger scale, Y seen on line 6-6 of Figure 4.

Figure 7 is a diagrammatic view, in perspective and partly broken away, of the cutting drawn thread mechanism.

Figures'l and 2 show at 1 the front part of the armfand at 2 the front part of the table or work plate of the machine, the general arrangement of which is similar to that of an ordinary sewing-machine. I Figures 1 and 3 also show the fabric feeding device 3 supported by the feed slide 27, itself operated by driving means well known in similar machines and in sewing machines, but not here shown for greater clearness. A presser-foot 4 having two articulated and compensated branches 5 and 6, carries the two presser shoes 7 and 8, which press the fabric down upon the feed dogs 3a and 4a of the feeding device 3. The presser foot 4 is supported by the presser bar 9 which is pushed downwardly by the spring 10, the pressure of which is adjustable by the milled head nut, 11. This arrangement is moreover well known in itself. 91

The thread-drawing tool12 consisting of a saw-toothed spear or blade is fixed by the screw 13 in the rod 14, the movementof which I is effected by the group formed by the crankdisc 15,"connecting rod 16 and attachment 17 1 the whole being driven from the main shaft 18 according to a well known movement in sewing machines and the like.

A second presser foot 19, which may be fitted with a conical or other rubber pad 196 is supported by the rod 20 and pressed against the fabric by the spring 21, of which the pressure is regulated by the milled-head nut 22. This second presser foot, the essential object of which is to maintain the fabric well stretched at the moment of its perforation by the thread-drawing tool, is lifted automatical- 1y at the time of the fabric feed, this lift being effected by the cam 23 mounted on the mam shaft 18 and actuating the bell-crank 24, which pivots 011 the pin 24a and of which the arm 25 thus causes the lifting of the presser-foot 19 by the intermediary of the ring or fork 26.

Beneath the table of the machine is arranged the mechanism utilized for the cutting of the threads. This mechanism consists essentially of a knife 30 fixed by the screw 31 to a supporting disc 32, which is subjected both to a movement of rotation around its axis 38 and to a reciprocating movement up and down, effected as will be hereafter explained. The knife 30, in the course of a complete revolution in the direction of the arrow F, passes below the feed dog 3a of the feeding device 3, and then, as it rises, comes into contact with a slightly flexible stationary or ledger blade 33, fixed to the table of the mar chine by the screw 28. This permits the lniife to be spaced a sufiicient distance from its axis of rotation, without too great separation of the two dogs or branches 3a and 3b of the feeding device, but keeping these two dogs symmetrical relatively to the thread-drawing tool 12, such being conditions for good workmg.

There will be noted also the plate 3a upon Which the fabric rests and in which are formed the slots for the passage of the feed dogs 3a and 3b. The plate 33, shown in Figure 3, is provided with a slot 35 for the passage of the thread-drawing tool 12, and is bevelled or tapered off at its flexible end 37. The edge 35a of the slot 35 over which the threads drawn out by the tool 12 hang down, is sharpened so that the keen edge 36 of the cutter knife 30 has a scissorsdike action against this edge 35a at the moment of the cut; this scissors-like action determines the clean cutting of the drawn threads.

The reciprocating up and down. movement of the cutter knife 30 serves in the first place to permit this knife to pass freely under the dog 366 of the feeding device, which obviates any need of shifting the dog 3a towards the left of Figure 1, which would either destroy the symmetry of the feeding device or necessi-' tate shifting the other feed dog and thereby giving the two branches of the feeding device an excessively wlde separation.

Further, this up and down movement permits the cutter knife to come tightly against the plate 33. At the moment of the cut, the cutter knife 30 travels horizontally, pressing against the stationary ledger blade 33 and thus producing a scissors-like cut against the bevelled cutting edge 35a of this ledger blade.

On the other hand, as will hereafter e explained, the height of the rising movement of the disc is adjustable, and consequently it is possible, after.resharpening of the knife to take up the wear thereof by varying the adjustment of this height.

For the cutter knife, of which the advantages have just been briefly descrihee, a suitable operating mechanism may be arranged in the following manner, given by way of ex ample :-The shaft 38 supporting the disc is mounted in a sleeve or socket 39, along which it can slide, while being driven in its rotation by means of two screw heads l0 and 41, which engage respectively in the slots 4.2 and .3 formed for this purpose in the socket 39. This socket revolves in a housing it, in which it is held endwise by its operating pinion and the ring or collar 1-8. The pinion 45 is driven by a pinion at, the movement of which, imparted by the shaft -l8, is obtained from the main shaft 18 of the machine by a suitable transmission not shown). The proportion of this transmission and of the gear pinions 47 and 45 is so determined that the socket 39 makes one complete revolution for one complete revolution of the shaft 18. The shaft 38 is provided at its lower end with a cylindrical box cam 19, secured in place thereon by the set screw 50, of which the point engages in a longitudinal groove in the shaft 38. This cam imparts to the shaft 38, in the course of its rotation, the alternating up and down movement previously described, by the aid of the roller 51 mounted rotatablv on the screw pin 52, this latter being mounted. in a fixed support 52a.

The adjustment for height of the knife. which has already been mentioned. can be given by way of example in the following: manner :-The lower end of the shaft 38 is screw-threaded to take a nut 53 with a milled periphery, which is rendered fast as to height with the cam 49 by the teuons 5i and .7 once the screw is loosened, the nut enables this cam to be adjusted relatively to the shaft 38, thereby altering the height of the disc 32.

The pointed set screw 50 serves then in the present instance only for the locking of this adjusting device.

The operation of a thread drawing machine, having the parts which have just been described, is the following The prcsserfeet 4 and 19 being lowered (the latter being especially entended to keep the fabric tightly stretched), the piercer or thread drawing tool 12 descends and draws out the longitudinal threads of the fabric; during this time,

the cutter knife is passing below the feed do 7 3a, but as soon as thevthread drawing too passes out again above the fabric,'the knife 30comcs round to the ledger blade 33 and cuts the threads drawn out and turned down by the tool 12, in the manner above explained.

When this operation is finished, the presserfoot with the india rubber pad 19 lifts and the advance of the fabric takes place by the aid of the feedingdevice 3. By reason of the absolutely symmetrical arrangementof the feeddogsBa and 3b and of the presser shoes 8 and 7 relatively to the plate 33, this feed movementis effected in a direction strictly perpendicular to the plane of the threaddrawing-tool.

When this feed movement is completed, the rubber presser-foot returns to hold and stretch the fabric, and the thread drawing toolagain descends to recommence once more the series of'operations which have been described.

There willbe noted upon the drawing that the housing 44 comprises a guard 56 intended to protect the driving gears from the waste produced by the cutting of the threads.

WhatI claim is 1 1. A machine for drawing threads from a fabric which comprises in combination, a work plate, meansfor holding the fabric against said plate, a thread drawing tool adapted to reciprocate in a directionat right angles to said plate for drawing the threads below said plate, a knife disposed below said plate with its edge parallel to said plate adapted to rotate about an axis at right angles to said plate and means for rotating said knife about said axis.

2. A machine for drawing threads from a fabric which comprises in combination, a work plate, means for holding the fabric against said plate, a ledger blade secured to said plate, a thread drawing tool adapted to reciprocate in a direction at right angles to said plate for drawingthe threads below said plate, over the edge of said ledger blade, a knife disposed below said plate with its edge parallel thereto adapted to rotate about an axis at right angles to said plate so as to cooperate with theedge of said ledger blade and means for rotating said knife about said axis.

' 3. A machine for drawing threads from a fabric which comprises in combination a work plate. means for holding the fabric against said plate, a ledger bladesecured to said plate, a thread drawing tool adapted to reciprocatein a direction at right angles to said plate for drawing the threads below said plate ovcrthe edge of said ledger blade, a knife disposed below said blade with its edge parallel thereto adapted to rotate about an axis-at right angles to said plate so as to cooperate with the edge of said blade, means for rotating said knife about said axis, feeding means for effecting the advance of the fabric and means for reciprocating said knife along its axis 'of rotation in such manner as to cause it to pass below said feeding means and to bring it into proper relative position with respect to said ledger blade.

4. A machine for drawing threads from a fabric which comprises in' combination, a work plate, means for holding the fabric against said plate, a ledger-blade secured to said plate, a thread drawing tool adapted to reciprocate in a direction at right angles to said plate for drawing the thread below said plate over the edge of said ledger blade, a knife disposed below said plate with its edge parallel thereto, feeding means for effecting the advance of the fabric, a shaft adapted to support said knife in an eccentric position, means for removably fixingsaid knife on said shaft, and means for giving said shaft a reciprocating sliding motion, whereby the knife is caused to pass below said feeding means and brought into proper relative positior:i with respect to the edge-of said ledger bla e.'

5. A machinefor drawing threads from a fabric which comprises in combination, a horizontalwork plate, means for holding the fabric against said plate, a ledger blade secured. to said plate and provided with-ran elongated transversal slot, a thread tool for drawing the threads through said slot, a knife disposed below said plate with its edge parproper relatii e position with respect to the edge'of said ledger blade.

6. A machine for drawing threads from a fabric which'comprises in combination, a

horizontal work plate, means for holding the fabric against said plate, a ledger blade secured to said plate and provided with an elongated transversal slot, a=thread drawing tool for drawing the threads through said slot, a knife disposed below said plate with its edge parallel thereto adapted to cooperate with the ledger blade, feeding means for effecting the advance of the fabric, a shaft adaptedto support said knife in an eccentric position, means for removably fixing sa1d knife on said shaft. a sleeve surrounding said shaft provided with a longitudinal elongated slot, a train of gear wheels for rotating sa1d sleeve, a screw fixed to sa1d shaft and engaging said last mentioned slot,

means for reciprocating said shaft within said sleeve wherebythe knife is caused to pass below said feeding means and brought into proper relative position with respect to the edge of said ledger blade.

7. A machine for drawing threads from a fabric which comprises in combination, a horizontal work plate, means for holding the fabric against said plate, a ledger blade secured to said plate and provided with an elongated transversal slot, a thread drawing tool for drawing the threads through said slot, a knife disposed below said plate with its edge parallel thereto adapted to cooperate with the ledger blade, feeding means for effecting the advance of the fabric, a shaft adapted to support said knife in an eccentric position, means for removably fixing said knife on said shaft, a sleeve surrounding said shaft provided with a longitudinal elongated slot, a train of gear wheels for rotating said sleeve, a screw fixed to said shaft and engaging said last mentioned slot, a cam secured to said shaft, a roller secured to a stationary part of the machine so as to give said shaft a reciprocating motion within said sleeve, whereby the knife is caused to pass below said feeding means and brought into proper relative position with respect to the edge of said ledger blade.

8. A machine for drawing threads from a fabric which comprises in combination, a work plate, means for holding the fabric against said plate, a ledger blade secured to said plate, a thread drawing tool adapted to reciprocate in a direction at right angles to said plate for drawing the threads below said plate over the edge of said ledger blade, a knife disposed below said plate with its edge parallel thereto adapted to rotate about an axis at right angles to said plate so as to co- 1 operate with the edge of said ledger blade, means for rotating said knife about said axis and means for adjusting the height of the knife with respect to said ledger blade.

9. A machine for drawing threads from a fabric which comprises in combination, a work plate, means for holding the fabric against said plate, a ledger blade secured to said'plate, a thread drawing tool adapted to reciprocate in a direction at right angles to said plate for drawing the thread below said plate over the edge of said ledger blade, a knife disposed below said plate with its edge parallel thereto, feeding means for effecting the advance of the fabric, a shaft adapted to support said knife in an eccentric position, means for removably fixing said knife on said shaft, means for giving said shaft a reciprocating motion, whereby the knife is caused to pass below said feeding means and brought into proper relative position with respect to the edge of said ledger blade, and means for adjusting the height of the knife with respect to said ledger blade.

10. A machine for drawing threads from a fabric which comprises in combination, a work plate, means for holding the fabric against said plate, aledger blade secured to said plate, a thread drawing tool adapted to reciprocate in a direction at right angles to said plate for drawing the threads below said plate over the edge of said ledger blade, a knife disposed below said plate with its edge parallel thereto adapted to rotate about an axis at right angles to said plate so as to cooperate with the edge of said ledger blade, means for rotating said knife about said axis, a presser foot and means for applying said presser foot against the work plate during the downward stroke of the thread drawing tool.

11. A machine for drawing threads from a fabric which comprises in combination, a horizontal work plate, means for holding the fabric against said plate, a ledger blade secured to said plate, a thread drawing tool adapted to reciprocate in a vertical direction for drawing the threads below said plate over the edge of said ledger blade, a knife disposed below said plate with its edge parallel thereto adapted to rotate about a vertical axis so as to cooperate with the edge of said ledger blade, means for rotating said knife about said axis, a presser foot, means for applying said pressed foot against the work plate during the downward stroke of the thread drawing tool, and means for lifting said presser foot at the moment of the advance of the fabric.

In testimony whereof I have signed this specification.

GEORGES J ALBERT. 

